硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (7): 2299-2311.DOI: 10.16552/j.cnki.issn1001-1625.2025.1257
收稿日期:2025-12-16
修订日期:2026-01-22
出版日期:2026-07-15
发布日期:2026-08-13
通信作者:
赫中营,博士,教授。E-mail:3792097137@qq.com作者简介:王梦瑶(1989—),女,讲师。主要从事混凝土力学性能的研究。E-mail:2541052037@qq.com
基金资助:
WANG Mengyao1(
), ZHAO Yuanzhuo2, DU Wenfeng2, HE Zhongying2(
)
Received:2025-12-16
Revised:2026-01-22
Published:2026-07-15
Online:2026-08-13
摘要:
为提升寒冷盐碱地区再生混凝土的耐久性,以C30再生混凝土为对象,设置 0%、2.0%、4.0%、6.0%、8.0%(质量分数)五个生物炭掺量梯度,并采用普通养护与CO2养护两种方式,通过硫酸盐冻融循环试验测定了质量损失率、相对动弹性模量及抗压强度损失率等宏观指标,结合核磁共振技术对孔隙结构进行微观分析,并基于Weibull 分布构建了损伤模型,用于预测混凝土在盐冻环境下的服役寿命。结果表明:生物炭可显著改善再生混凝土抗盐冻性能,最优掺量为4.0%,在该掺量下,普通养护试件经300次冻融循环后,质量损失率、相对动弹性模量及抗压强度损失率较基准组分别改善46.8%、58.0%与22.7%;采用CO2养护可进一步提升性能,同掺量下质量损失率与抗压强度损失率较普通养护组分别降低36.8%、33.1%。生物炭多孔吸附特性与CO2养护碳化致密化作用协同优化了混凝土的孔隙结构,减少有害孔比例。基于Weibull分布的损伤模型拟合效果良好,预测华北地区该最优组合试件服役寿命可达9 288 d,较基准组提升175.4%。研究证实,生物炭与CO2养护的协同作用对再生混凝土抗盐冻性能具有“1+1>2”的增强效果,可显著延长其在寒冷盐碱环境下的服役寿命。
中图分类号:
王梦瑶, 赵远卓, 杜文风, 赫中营. 盐冻环境下CO2养护生物炭再生混凝土的损伤规律与寿命预测[J]. 硅酸盐通报, 2026, 45(7): 2299-2311.
WANG Mengyao, ZHAO Yuanzhuo, DU Wenfeng, HE Zhongying. Damage Law and Life Prediction of CO2 Curing Biochar Recycled Concrete under Salt Freezing Environment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(7): 2299-2311.
| Chemical composition | CaO | SiO2 | Al2O3 | Fe2O3 | MgO |
|---|---|---|---|---|---|
| Mass fraction/% | 62.5 | 21.3 | 5.8 | 3.1 | 2.2 |
表1 水泥主要化学成分
Table 1 Main chemical composition of cement
| Chemical composition | CaO | SiO2 | Al2O3 | Fe2O3 | MgO |
|---|---|---|---|---|---|
| Mass fraction/% | 62.5 | 21.3 | 5.8 | 3.1 | 2.2 |
| Type | Bulk density/(kg·m-3) | Apparent density/(kg·m-3) | Water absorption/% | Crushing index/% | Flaky and elongated particle mass fraction/% | Mortar mass fraction/% | Water-soluble sulfate ion mass fraction/% |
|---|---|---|---|---|---|---|---|
| Recycled aggregate | 1 480 | 2 420 | 6.8 | 12.5 | 8.2 | 25.87 | 1.37 |
表2 再生骨料基本物理性能
Table 2 Basic physical properties of recycled aggregate
| Type | Bulk density/(kg·m-3) | Apparent density/(kg·m-3) | Water absorption/% | Crushing index/% | Flaky and elongated particle mass fraction/% | Mortar mass fraction/% | Water-soluble sulfate ion mass fraction/% |
|---|---|---|---|---|---|---|---|
| Recycled aggregate | 1 480 | 2 420 | 6.8 | 12.5 | 8.2 | 25.87 | 1.37 |
| Chemical composition | C | SiO2 | Al2O3 | CaO | K2O |
|---|---|---|---|---|---|
| Mass fraction/% | 78.5 | 12.3 | 3.2 | 2.1 | 1.8 |
表3 生物炭主要成分
Table 3 Main chemical composition of biochar
| Chemical composition | C | SiO2 | Al2O3 | CaO | K2O |
|---|---|---|---|---|---|
| Mass fraction/% | 78.5 | 12.3 | 3.2 | 2.1 | 1.8 |
| Type | Specific surface area/(m2·g-1) | Porosity/% | Carbon mass fraction/% | pH value | Moisture mass fraction/% |
|---|---|---|---|---|---|
| Biochar | 426.5 | 58.2 | 82.3 | 9.1 | 2.1 |
表4 生物炭基本特性指标
Table 4 Basic characteristic indexes of biochar
| Type | Specific surface area/(m2·g-1) | Porosity/% | Carbon mass fraction/% | pH value | Moisture mass fraction/% |
|---|---|---|---|---|---|
| Biochar | 426.5 | 58.2 | 82.3 | 9.1 | 2.1 |
| Sample | Mix proportion/(kg·m-3) | |||||
|---|---|---|---|---|---|---|
| Cement | Biochar | Recycled aggregate | Sand | Water | Water reducing agent | |
| OC | 380.0 | 0 | 1 180 | 620 | 180 | 1.9 |
| BRC-2.0% | 372.4 | 7.6 | 1 180 | 620 | 180 | 1.9 |
| BRC-4.0% | 364.8 | 15.2 | 1 180 | 620 | 180 | 1.9 |
| BRC-6.0% | 357.2 | 22.8 | 1 180 | 620 | 180 | 1.9 |
| BRC-8.0% | 349.6 | 30.4 | 1 180 | 620 | 180 | 1.9 |
表5 不同生物炭掺量混凝土配合比
Table 5 Mix proportion of concrete with different biochar content
| Sample | Mix proportion/(kg·m-3) | |||||
|---|---|---|---|---|---|---|
| Cement | Biochar | Recycled aggregate | Sand | Water | Water reducing agent | |
| OC | 380.0 | 0 | 1 180 | 620 | 180 | 1.9 |
| BRC-2.0% | 372.4 | 7.6 | 1 180 | 620 | 180 | 1.9 |
| BRC-4.0% | 364.8 | 15.2 | 1 180 | 620 | 180 | 1.9 |
| BRC-6.0% | 357.2 | 22.8 | 1 180 | 620 | 180 | 1.9 |
| BRC-8.0% | 349.6 | 30.4 | 1 180 | 620 | 180 | 1.9 |
| Sample | Curing method | Northeast life/d | North life/d | Northwest life/d |
|---|---|---|---|---|
| OC | Ordinary curing | 2 232 | 3 192 | 2 280 |
| CO2 curing | 2 364 | 3 372 | 2 412 | |
| BRC-4.0% | Ordinary curing | 4 200 | 6 000 | 4 296 |
| CO2 curing | 6 480 | 9 288 | 6 612 |
表4 不同生物炭掺量组混凝土的盐冻服役寿命预测
Table 4 Prediction of service life of concrete with different biochar content groups in salt freezing
| Sample | Curing method | Northeast life/d | North life/d | Northwest life/d |
|---|---|---|---|---|
| OC | Ordinary curing | 2 232 | 3 192 | 2 280 |
| CO2 curing | 2 364 | 3 372 | 2 412 | |
| BRC-4.0% | Ordinary curing | 4 200 | 6 000 | 4 296 |
| CO2 curing | 6 480 | 9 288 | 6 612 |
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